High definition stuff is also discussed here, here, and samples are here, but yeah, we've got a listening test thread now, so might as well use it...

My equipment is an M-Audio Revolution 7.1 feeding straight to Sennheiser HD 200 headphones. I downloaded Lovely_1.wv and used foobar2000 to do resampling, replaygaining, and ABXing. At first I was using waveOut, but then I retested them all using Kernel Streaming.

My results varied a bit, but all were significant. The first test I did, I was not expecting to hear any difference, so I was very careful, and got 12/12. Since then I've had 12/12s, 11/12s, a 10/10, and an 8/8 (got interrupted but still a valid result, and it was only a retest...)

The most consistently hearable difference for me is when I listen between 5.2 and 7.2 seconds. Some sort of drum gets hit at about 5.7s. The high definition one is somehow more convincing. Today I was thinking of the good one as a push and the bad one as a pull, but yeah that's not a very helpdul description..

I'm also hearing other differences, but it's hard to know whether I'm being tipped off by something while focussing on something else, or even what the actual difference is in objective terms.

So, what could be wrong? What else would be worth testing? I was thinking of noise shaping the output maybe... I'm not that keen to do a huge amount of retesting with every possible combination, but if someone thinks of something important I'll be sure to check it.

Sure I will try the next batch, and double check foobar when I do. About volume, yes I use just the master volume on Revo control panel. It's set on about 3/4. Sensaura mode is not on, and the sample rate selector shows 96000. Might be a bit longer this time, I'm trying the tests on other people too.. although a result from somewhere else would be better, just to show it's not my setup going wrong.

Garf,the difference I hear is subtle, and most of the time I have to play around with the files for a while before I can rely on what I think I'm hearing. Once I figure it out, of course I use the reset button before trying for a good result. I don't see how a result of say 10 in a row is worthless in any context, assuming I haven't made hundreds (or thousands ) of attempts before it.